Comparing between the desktop experience running Ubuntu on my laptop with Mac OSX, I perceive the latter to have superior window management - via mission-control (blending the benefits of expo/scale)
A few extra options may help acheive window & desktop management tasks with fewer clicks or mental steps.
The following features are useful:-
-"expose"(Compiz-Scale) - all applcation windows option"
-multitouch gestures for switching between desktops
-"fullscreen" command - single clitk to instantly an application full-screen, occupying a new desktop.
The original desktop remains. Saves having to manually create a desktop and move the window across - leverages the desktop-switching ability more. It is very easy to end up with a mixture of fullscreen desktops and mixed windows
I beleive all of these features would also benefit touchscreen implemenations of the desktop environment - acheive window management tasks with fewer clicks and less 'dragging' operations